The smallest museum in Basel, Switzerland, is a two-foot-by-two-foot window in the door of a 600-year-old house.

Along the Rhine, about a mile from the historic Munster, learn the heartrending story of two lovers torn asunder, cast into unknown layers of time and space.

The bears of Bern have been a city highlight for over 500 years.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

The Swiss artist's bulbous and overgrown shape-shifting sculpture controversially graces the center of Bern.

Abbey built on the ruins of Roman catacombs.

World's largest permanent maze made of 18,000 conifers.

A symbol of friendship between the mountainous regions of Switzerland and Bhutan.

For centuries no one knew there were hundreds of bones and precious artwork hidden beneath this Swiss church.

A house carved into a rock in the 1940s.

The fifth-longest natural arch in the world, and the longest outside China.

A decommissioned submarine base makes a great space for graffiti art.

This little gem in the Gulf of Riga has a very rich heritage and distinct culture.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

This hidden collection of everyday objects illustrates life within communist Poland.

A delightful museum entirely dedicated to the tiny homes of dolls.

The world’s narrowest house makes for an awkward, four-foot-wide living space.

This unique railroad museum secretly contains the history of Poland rebuilding itself from the inside-out.

Dubbed "Wistom" by locals, this abandoned factory is an urban explorer's dream.

Hundreds of notes give thanks to the patron saint of lost causes.

Warsaw's fantastically preserved gasworks...almost.

An artificial date palm stands as a memorial to Warsaw's Jewish community.